# std::sub_match<BidirIt>::sub_match

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< cpp‎ | regex‎ | sub match

constexpr sub_match(); |  | (since C++11)

Default constructs a std::sub_match. The `matched` member is set to false and the inherited members `first` and `second` are value-initialized.

This is the only publicly accessible and defined constructor.

### Example

Run this code

    #include <cassert>
    #include <regex>

    int main()
    {
        std::sub_match<const char*> s;
        assert(!s.matched);
    }

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